Free Health Tools
BMI Calculator
Instantly calculate your BMI and understand what the result means — and what it doesn’t — for your health.
Free Health Tools
BMI Calculator
Instantly calculate your BMI and understand what the result means — and what it doesn’t — for your health.
Free Health Tools
BMI Calculator
Instantly calculate your BMI and understand what the result means — and what it doesn’t — for your health.
Understanding Your BMI — And What It Means for Your Health
Is my BMI Good or Bad - and what should i do next?
Is my BMI Good or Bad - and what should i do next?
Why does BMI sometimes give 'Wrong' results?
Why does BMI sometimes give 'Wrong' results?
How do i turn my BMI into a daily calories & protein target:
How do i turn my BMI into a daily calories & protein target:
Fettle turns nutrition science into a practical system that adapts week by week - helping you eat better, stay consistent, and make progress without overthinking or obsessing over every meal.
Instead of rigid plans or constant manual tracking, Fettle guides decisions upfront and adjusts as your body, habits, and goals change over time.
Interpreting BMI
Understanding Your BMI - And What It Means For Your Health
Fettle turns nutrition science into a practical system that adapts week by week - helping you eat better, stay consistent, and make progress without overthinking or obsessing over every meal.
Instead of rigid plans or constant manual tracking, Fettle guides decisions upfront and adjusts as your body, habits, and goals change over time.
Interpreting BMI
Understanding Your BMI - And What It Means For Your Health
Fettle turns nutrition science into a practical system that adapts week by week - helping you eat better, stay consistent, and make progress without overthinking or obsessing over every meal.
Instead of rigid plans or constant manual tracking, Fettle guides decisions upfront and adjusts as your body, habits, and goals change over time.
Is my BMI Good or Bad - and what should i do next?
Is my BMI Good or Bad - and what should i do next?
Why does BMI sometimes give 'Wrong' results?
Why does BMI sometimes give 'Wrong' results?
How do i turn my BMI into a daily calories & protein target:
How do i turn my BMI into a daily calories & protein target:
Daily Nutrition Targets
Calculating your Personal Daily Calorie & Protein Targets
Using your height, weight, age, and activity level, we estimate your Total Daily Energy Expenditure (TDEE) — the calories your body needs each day.
Daily Nutrition Targets
Calculating your Personal Daily Calorie & Protein Targets
Using your height, weight, age, and activity level, we estimate your Total Daily Energy Expenditure (TDEE) — the calories your body needs each day.
Daily Nutrition Targets
Calculating your Personal Daily Calorie & Protein Targets
Using your height, weight, age, and activity level, we estimate your Total Daily Energy Expenditure (TDEE) — the calories your body needs each day.
TDEE Calculator
Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a day.
Protein Calculator
Daily Protein Targets
Protein needs vary by body weight, goal and activity - not one-size-fits-all-rules.
This is a LOT to calculate - and it changes over time depending on your goal.
Fettle updates these targets automatically, based on your weight, activity, goals, and weekly progress.
Why Thousands Trust Fettle
Doing your own calculations is the #1 reason people fail.
Fettle updates them automatically - every single week.
Why Thousands Trust Fettle
Doing your own calculations is the #1 reason people fail.
Fettle updates them automatically - every single week.
Why Thousands Trust Fettle
Doing your own calculations is the #1 reason people fail.
Fettle updates them automatically - every single week.
Science-Backed Calculations
Most calorie calculators use outdated formulas or oversimplified numbers.
Fettle uses a clinically validated method designed by a registered nutritionist - the same approach used by professionals working with athletes and weight-loss patients.
Adjusts for body fat %, not just height and weight
Calculate minimum safe fats, proteins and carbs
Re-checks metabolic data every week
Weekly Personalisation
Your body changes - your calories should too.
Every 7 days, Fettle analyses your check-in data (weight, waist, hips, activity) and automatically adjusts your calories and macro targets. No guesswork. No manual maths. No confusion.
Accounts for plateaus and metabolic slowdown.
Prevents overeating or under-eating.
Designed for long-term sustainable results.
Real-Life Usability
You don't live inside a spreadsheet - and your nutrition plan shouldn't feel like one.
Fettle gives you simple meal plans, quick swaps, realistic recipes, and a shopping list that fits your actual lifestyle.
Recipes based on your taste preferences.
Amazon Fresh Integration (Others coming soon).
Works whether you cook daily or rely on quick meals.
Science-Backed Calculations
Most calorie calculators use outdated formulas or oversimplified numbers.
Fettle uses a clinically validated method designed by a registered nutritionist - the same approach used by professionals working with athletes and weight-loss patients.
Adjusts for body fat %, not just height and weight
Calculate minimum safe fats, proteins and carbs
Re-checks metabolic data every week
Science-Backed Calculations
Most calorie calculators use outdated formulas or oversimplified numbers.
Fettle uses a clinically validated method designed by a registered nutritionist - the same approach used by professionals working with athletes and weight-loss patients.
Adjusts for body fat %, not just height and weight
Calculate minimum safe fats, proteins and carbs
Re-checks metabolic data every week
Weekly Personalisation
Your body changes - your calories should too.
Every 7 days, Fettle analyses your check-in data (weight, waist, hips, activity) and automatically adjusts your calories and macro targets. No guesswork. No manual maths. No confusion.
Accounts for plateaus and metabolic slowdown.
Prevents overeating or under-eating.
Designed for long-term sustainable results.
Weekly Personalisation
Your body changes - your calories should too.
Every 7 days, Fettle analyses your check-in data (weight, waist, hips, activity) and automatically adjusts your calories and macro targets. No guesswork. No manual maths. No confusion.
Accounts for plateaus and metabolic slowdown.
Prevents overeating or under-eating.
Designed for long-term sustainable results.
Real-Life Usability
You don't live inside a spreadsheet - and your nutrition plan shouldn't feel like one.
Fettle gives you simple meal plans, quick swaps, realistic recipes, and a shopping list that fits your actual lifestyle.
Recipes based on your taste preferences.
Amazon Fresh Integration (Others coming soon).
Works whether you cook daily or rely on quick meals.
Real-Life Usability
You don't live inside a spreadsheet - and your nutrition plan shouldn't feel like one.
Fettle gives you simple meal plans, quick swaps, realistic recipes, and a shopping list that fits your actual lifestyle.
Recipes based on your taste preferences.
Amazon Fresh Integration (Others coming soon).
Works whether you cook daily or rely on quick meals.
Science-Backed Calculations
Most calorie calculators use outdated formulas or oversimplified numbers.
Fettle uses a clinically validated method designed by a registered nutritionist - the same approach used by professionals working with athletes and weight-loss patients.
Adjusts for body fat %, not just height and weight
Calculate minimum safe fats, proteins and carbs
Re-checks metabolic data every week
Science-Backed Calculations
Most calorie calculators use outdated formulas or oversimplified numbers.
Fettle uses a clinically validated method designed by a registered nutritionist - the same approach used by professionals working with athletes and weight-loss patients.
Adjusts for body fat %, not just height and weight
Calculate minimum safe fats, proteins and carbs
Re-checks metabolic data every week
Weekly Personalisation
Your body changes - your calories should too.
Every 7 days, Fettle analyses your check-in data (weight, waist, hips, activity) and automatically adjusts your calories and macro targets. No guesswork. No manual maths. No confusion.
Accounts for plateaus and metabolic slowdown.
Prevents overeating or under-eating.
Designed for long-term sustainable results.
Weekly Personalisation
Your body changes - your calories should too.
Every 7 days, Fettle analyses your check-in data (weight, waist, hips, activity) and automatically adjusts your calories and macro targets. No guesswork. No manual maths. No confusion.
Accounts for plateaus and metabolic slowdown.
Prevents overeating or under-eating.
Designed for long-term sustainable results.
Real-Life Usability
You don't live inside a spreadsheet - and your nutrition plan shouldn't feel like one.
Fettle gives you simple meal plans, quick swaps, realistic recipes, and a shopping list that fits your actual lifestyle.
Recipes based on your taste preferences.
Amazon Fresh Integration (Others coming soon).
Works whether you cook daily or rely on quick meals.
Real-Life Usability
You don't live inside a spreadsheet - and your nutrition plan shouldn't feel like one.
Fettle gives you simple meal plans, quick swaps, realistic recipes, and a shopping list that fits your actual lifestyle.
Recipes based on your taste preferences.
Amazon Fresh Integration (Others coming soon).
Works whether you cook daily or rely on quick meals.
Loved by Real People
Accountant
“Fettle finally made healthy eating doable. I’m a busy dad and this is the first app I’ve actually stuck to.”
@mark_j
Busy Professional
Accountant
“Fettle finally made healthy eating doable. I’m a busy dad and this is the first app I’ve actually stuck to.”
@mark_j
Busy Professional
Accountant
“Fettle finally made healthy eating doable. I’m a busy dad and this is the first app I’ve actually stuck to.”
@mark_j
Busy Professional
iOS User
“The weekly check-ins helped me lose 4kg in six weeks. No stress, no calorie obsession — just simple guidance.”
@sophie.fit
Weight Loss Progress
iOS User
“The weekly check-ins helped me lose 4kg in six weeks. No stress, no calorie obsession — just simple guidance.”
@sophie.fit
Weight Loss Progress
iOS User
“The weekly check-ins helped me lose 4kg in six weeks. No stress, no calorie obsession — just simple guidance.”
@sophie.fit
Weight Loss Progress
Mum of 2
“I love that it lets me follow my macros while still eating Chinese food. My parents couldn’t believe an app finally understands our cuisine!”
@kelly_lau
Cultural Fit
Mum of 2
“I love that it lets me follow my macros while still eating Chinese food. My parents couldn’t believe an app finally understands our cuisine!”
@kelly_lau
Cultural Fit
Mum of 2
“I love that it lets me follow my macros while still eating Chinese food. My parents couldn’t believe an app finally understands our cuisine!”
@kelly_lau
Cultural Fit
Stop guessing. Start progressing.
Free to try. No commitment. No Spam.
Guidance First, Tracking Second
A different way to approach nutrition
Most nutrition apps ask you to log everything first — then leave the hard decisions to you.
Fettle works the other way around.
We help you understand how much to eat, what fits your targets, and how to plan for real life, so tracking becomes a tool for refinement — not pressure, guilt, or guesswork.
This is nutrition designed to guide decisions upfront, adapt over time, and support progress without punishment.
Guidance First, Tracking Second
A different way to approach nutrition
Most nutrition apps ask you to log everything first — then leave the hard decisions to you.
Fettle works the other way around.
We help you understand how much to eat, what fits your targets, and how to plan for real life, so tracking becomes a tool for refinement — not pressure, guilt, or guesswork.
This is nutrition designed to guide decisions upfront, adapt over time, and support progress without punishment.
How much to eat
Fettle calculates your calorie and macro targets using evidence-based formulas — then updates them as your body, activity, and goals change.
You start with clarity, not guesswork.
How much to eat
Fettle calculates your calorie and macro targets using evidence-based formulas — then updates them as your body, activity, and goals change.
You start with clarity, not guesswork.
What fits your target
Meals are matched to your targets — not the other way around.
Fettle helps you choose foods and portions that fit your goals and preferences, without rigid rules or food anxiety.
What fits your target
Meals are matched to your targets — not the other way around.
Fettle helps you choose foods and portions that fit your goals and preferences, without rigid rules or food anxiety.
How to plan for real life
From meal ideas to shopping lists, Fettle helps you plan in a way that works outside the app.
So staying on track feels practical, flexible, and sustainable — even on busy weeks.
How to plan for real life
From meal ideas to shopping lists, Fettle helps you plan in a way that works outside the app.
So staying on track feels practical, flexible, and sustainable — even on busy weeks.
Your Nutrition Superpower
How Fettle Works
Your personalised plan is built in minutes - and adapts every week based on your results.
Your Nutrition Superpower
How Fettle Works
Your personalised plan is built in minutes - and adapts every week based on your results.
How Much To Eat
Fettle calculates your calorie and macro targets using evidence-based formulas — then updates them as your body, activity, and goals change.
You start with clarity, not guesswork.
How Much To Eat
Fettle calculates your calorie and macro targets using evidence-based formulas — then updates them as your body, activity, and goals change.
You start with clarity, not guesswork.
What Fits Your Targets
Meals are matched to your targets — not the other way around.
Fettle helps you choose foods and portions that fit your goals and preferences, without rigid rules or food anxiety.
What Fits Your Targets
Meals are matched to your targets — not the other way around.
Fettle helps you choose foods and portions that fit your goals and preferences, without rigid rules or food anxiety.
How To Plan For Real Life
Fettle turns your plan into action — from meals to shopping.
Meals you choose are organised into a weekly shopping list, so staying on track doesn’t rely on memory, willpower, or extra admin.
How To Plan For Real Life
Fettle turns your plan into action — from meals to shopping.
Meals you choose are organised into a weekly shopping list, so staying on track doesn’t rely on memory, willpower, or extra admin.